Accepted 9 September, 2008

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1 African Journal of Biotechnology Vol. 8 (3), pp , 4 February, 2009 Available online at ISSN Academic Journals Full Length Research Paper Comparative essential oils composition and insecticidal effect of different tissues of Piper capense L., Piper guineense Schum. et Thonn., Piper nigrum L. and Piper umbellatum L. grown in Cameroon Tchoumbougnang François 1 *, Jazet Dongmo Pierre Michel 2, Sameza Modeste Lambert 1, Fombotioh Ndifor 1, Wouatsa Nangue Arlette Vyry 1, Amvam Zollo Paul Henri 2 and Menut Chantal 3 1 Laboratory of Biochemistry, Faculty of Science, University of Douala, PO Box Douala, Cameroon. 2 ENSAI-University of Ngaoundéré, PO Box 455 Ngaoundéré, Cameroun. 3 Ecole Nationale Supérieure de Chimie de Montpellier, Montpellier Cedex 5, France. Accepted 9 September, 2008 This study compared the chemical composition of the essential oils obtained by hydrodistillation of different tissues of Piper capense, Piper guineense, Piper nigrum and Piper umbellatum grown in Cameroon. The GC and GC/MS analysis showed qualitative and quantitative differences between these oils. Oils from the fruits were rich in α-pinene ( %) and β-pinene ( %). The other major constituents were sabinene (14.7%) for P. capense, limonene (15.8%) and β-caryophyllene (20.8%) for P. guineense. The oil from the fruits of P. nigrum contained sabinene (11.2%), δ-3-carene (18.5%), limonene (14.7%) and β-caryophyllene (12.8%) while that of P. umbellatum content linalool (14.4%) and (E)-nerolidol (10.0%) as major constituents. The essential oil obtained from the leaves of P. capense was largely composed of α-pinene (12.8%), -pinene (50.1%) and β-caryophyllene (12.4%). The most abundant constituents identified in the oil from the leaves of P. guineense were limonene (10.3%) and germacrene B (25.1%) while that from P. nigrum was characterized by its high amount of α-selinene (16.5%) and -selinene (14.6%). -pinene (10.8%), -caryophyllene (28.2%) and (E)-nerolidol (16.5%) were the quantitative important constituents of the essential oils from the leaves of P. umbellatum. The oils from the lianas of P. guineense was rich in (Z, E)-α-farnesene (28.7%), limonene (19.7%) and myristicine (10.9%), while those from P. nigrum contained δ-3-carene (14.4%) and -caryophyllene (36.0%). The oil from the stems of P. capense contained mostly α-pinene (14.3%) and -pinene (61.4%). The distillation of those from P. umbellatum did not produce any essential oil. Oils from the three fruits showed variable contact toxicity against Sitophilus zeamais with P. guineense being more toxic (LD 50 = 10.0 ± 0.3 µl/g) than P. capense (LD 50 = 16.1 ± 0.6 µl/g) and P. nigrum (LD 50 = 26.4 ± 1.5 µl/g). Poudrox (5%) used as a standard insecticide exhibited 100% mortality. Key words: Piper capense L., P.guineense Schum. Et Thonn., P. nigrum L., P. umbellatum L, essential oils, α- pinene, β-pinene, β-caryophyllene, insecticidal, Sitophilus zeamais Motsch. INTRODUCTION Piperaceae is one of the most widely distributed families of flowering plants. It consists of over 12 genera comprising about 1400 species distributed throughout tropical *Corresponding author. tchoumbougnang@yahoo.fr. and sub-tropical region in both hemispheres (Sengupta and Ray, 1987). They are erect, climbing, lianescent herbs or shrubs or infrequent trees that can be easily recognized by the simple and entire alternate leaves, rarely opposite or verticillate (Letouzey, 1972). This large and heterogeneous family is represented in Cameroon by the genera Peperomia and Piper. Of the 700 species of

2 Tchoumbougnang et al. 425 Table 1. Essential oil yields of four Piper species from Cameroon. Essential oil yields (%) Plant tissues P. capense P. guineense P. nigrum P. umbellatum Fruits Leaves Lianas or stems Piper, only three are recognized to be indigenous to Cameroon (Hutchinson and Dalziel, 1963). The first, Piper guineense, commonly known as the African black pepper, is a forest liana with gnarled branchlets spiraling up to shrubs to about 10 m. The leaves, elliptic in shape, have a pleasant aroma when they are crushed. Its small spherical fruits in racemes are yellow becoming orange, red and finally black (Iwu, 1993). The second species, Piper capense, is an under storey shrub common in gallery forest, with V-shaped branchless and pointed ovate leaves bearing seven basal nerves. Their fruits occur around January and March (Hutchinson and Dalziel, 1963). The third species is Piper umbellatum. It is a large shrub of about 1.5 to 2 m height with broad circular leaves deeply cordate at the base. The last Piper species which has been examined is Piper nigrum. This plant originates from India and has been introduced to Cameroon where it is now cultivated for the production of spices (Noumi, 1984). The Piper species have high commercial, economical and medicinal value. The aromatic fruits of some Piper are used as spices. The ripened fruit of P. nigrum is the source of white pepper while the unripe fruit is the source of black pepper. In West Cameroon, the seeds of P. guineense (usually dried or sometimes fresh) are used as flavor in Nah poh (yellow sauce) widely eaten by the Bamileke. In the South, leaves of P. umbellatum are eaten as vegetables and sometimes, the Betis peoples use them as condiment for cough, the Ndomba soup (Noumi, 1984). The genus Piper is also reputed for the medicinal proprieties of its plants. The preparations of leaves, roots and seeds of P. guineense are used internally as medical agents for the treatment of bronchite, gastrointestinal diseases, veneral diseases and rheumatism. The powder obtained from the ground seeds is used for its stimulating properties (Sofowora, 1982). In the literature, there are several studies on the essential oils composition of P. nigrum and P. guineense (Menut et al., 1998; Amvam et al., 1998; Jirovetz et al., 2002; Asawalam et al., 2007), and only one paper on the volatile composition of P. umbellatum (Vogler et al., 2006), whereas the oil of P. capense seem not to have been reported before. After our previous work on P. guineense from Cameroon and Congo (Menut et al., 1998), it was confirm that the chemical composition of the essential oils from differrent part of this plant depends on various factors such as geographical and climatic conditions. The purpose of the present study was to compare the chemical composition of different tissues of the four Piper species grown in Cameroon in order to provide more data on the oils composition of these spices. Their seeds are transformed in powders and used for the protection of grains by communities of the Western highlands of Cameroon. Since these grains are also powerful source of essential oils, the insecticidal activity of their oils were then evaluated by contact toxicity against Sitophilus zeamais, one of the pests of stored grain in Cameroon. MATERIALS AND METHODS Collection of plant material The plant samples were collected in April 2005 (Table 1). Their identification was carried out at the National Herbarium in Yaoundé where voucher specimens are kept under the following numbers: P. capense (2461/SRFK), P. guineense (3615/SRFK), P. nigrum (25818/SFR/Cm) and P. umbellatum (2854/SFR/Cm). Extraction of essential oils Fractions of 300 g of plant materiel of each Piper species were submitted for hydrodistillation in 1.5 L of water using a Clevengertype apparatus for 5 h. The obtained oil was dried over anhydrous sodium sulfate and, after filtration, stored at 4 C until tested and analyzed one or two months later. The yields were calculated according to the weight of plant material before distillation. Chemical analysis of essential oils Gas chromatography: The oils were analyzed on a Varian CP GC with flame ionization detectors and fitted with a fused silica capillary column (30 m x 0.25 mm coated with DB-1, film thickness (0.25 m), the oven temperature was programmed from C at 5 C/min, injector temperature 220 C, detector temperature 250 C, carrier gas N ml/min. The linear retention indices of the components were determined relative to the retention times of a series of n-alkanes, and the percentage compositions were obtained from electronic integration measurements without taking into account relative response factors. Gas Chromatography-Mass Spectrometry: GC/MS analyses were performed using a Hewlett-Packard apparatus equipped with an HP-1 fused silica column (30 m x 0.20 mm, film thickness 0.25 m) and interfaced with a quadrupole detector (Model 5970). The oven temperature was programmed from C at 10 C/min; injector temperature was 220 C. Helium was used as carrier gas at a flow rate of 0.6 ml/min; the mass spectrometer was operated at 70 ev.

3 426 Afr. J. Biotechnol. Identification of components: The identification of the constituents was assigned on the basis of comparison of their retention indices and mass spectra with those given in the literature (Joulain and Köning, 1998; Adams, 2001). Insecticidal activity of the oils against Sitophilus zeamais Adult of S. zeamais used for the study were obtained from infested maize grains collected in Santchou farmers granaries. These insects were identified by Dr M. Tindo (entomologist) on the basis of the morphological key of Delobel and Tran (1993). From this stock, new generations were reared in the laboratory on dry weevil susceptible white maize at room temperature 30 C. Freshly emerged adults of S. zeamais were then used for the experiments. Essential oils from the fruits of P. capense, P. guineense and P. nigrum which were in great amount were tested for contact toxicity on S. zeamais. Each oil applied to the grains at different doses (5 50 l/g of grain) was dissolve in 2 ml of acetone and stirred thoroughly with a glass rod for 5 min, to ensure uniform distribution over the grain surface. The treated grains were kept for 60 min to allow the solvent to evaporate completely before bioassays were conducted. 20 insects were introduced into vials of 125 ml containing the different treated and untreated maize grains. The lids of vials were perforated with holes. Muslin cloth held with rubber band was used to secure the mouth of the plastic vials to ensure aeration and avoid entry or exit of insects. Each treatment was replicated three times in a completely randomized design. The mortality was evaluated after 24 h of contact in each trial and compare to that of the control. Statistical analysis The results were given as means ± s.d. Percentages of mortality were calculated from the overall number of death insects. Raw data were compared using Fisher s exact-test (StatXact 2.05 software). Appropriate probabilities were adjusted for the number of simultaneous tests, using the sequential Bonferroni procedure (Rice, 1989): at the significance level ( = 0.05), statistical probabilities P were determined for k total number of pairwise tests and were ranked from smallest (P 1) to largest (P k). For independent samples (our situation), the test corresponding to Pi indicated significance if Pi (1-[1-]1/1+k-i). RESULTS AND DISCUSSION The yields of essential oils varied with plant species and plant tissues (Table 1). Whatever the plant part considered, P. guineense appears to be richer in oil ( % w/w) than the other plant species, while P. umbellatum was poorer ( %). The results of CG and CG/MS analysis of the essential oils are given in Table 2 where constituents are listed according to their elution order on DB-1 column. Monoterpenes ( %) were the predominant constituents in the essential oils obtained from the fruits. Among these, α-pinene ( %) and β-pinene ( %) were the most abundant compounds in the oils from seeds of P. capense, P. guineense and P. umbellatum. In addition to these constituents, sabinene (14.7%) as well as linalol (14.4%) were noted in the oil from fruits of P. capense and P. umbellatum respectively. The major monoterpenes from the seed oil of P. nigrum were δ-3-carene (18.5%), limonene (14.7%) and sabinene (11.2%). These results are different from the earlier published data on P. guineense collected in Cameroon riched in β-caryophyllene (57.59%). They are also different from those reported by Jirovetz et al. (2002) on P. nigrum dominated by germacrene D (11.01%) and β-pinene (10.02%). These compounds were present in relatively low concentration in our samples. It is also important to mention the small amount of myristicine (1.5%) in the seed oil of P. umbellatum. The oils from the leaves were in general different from those of the fruits because of the high content of sesquiterpenes ( %). The main constituents of this group were germacreme B (25.1%) for P. guineense, α-selinene (16.5%) and β-selinene (14.6%) for P. nigrum, β-caryophylene (28.2%) and (E)-nerolidol (16.5%) for P. umbellatum. Safrole (49.0%) has been found to be the major constituent of the leaf oil of P. umbellatum from Cuba, with smaller amount of germacrene D (8.0%) (Pino et al., 2005) while those from Sao Tomé e Príncipe show an abundance of -and -pinene (18.0 and 27.0% respectively) (Martins et al., 1998). Our sample of P. umbellatum essential oil is different from that from Costa Rica, dominated by -caryophyllene (28.0%), germacrene D (17.0%), and (E, E)--farnesene (15.0%) (Vogler et al., 2006). Interesting to notice is the small amount of myristicine (2.3% and 1.7% respectively) in the oils from the leaves of P. guineense and P. umbellatum. This component is absent in the oils from P. capense and P. nigrum. Analysis of the oils from the leaves of P. capense from Cameroon however, revealed the most prominent compounds to be α-pinene (12.8%) and β-pinene (50.1%); consequently, this oil is quantitatively rich in monoterpenes (80.8%). Due to the high proportion of the two main constituents α-pinene (14.3%) and β-pinene (61.4%), the oil obtained from the stem of P. capense is monoterpene predominate. The percentages of most of the remaining components are then below 5.0%. The essential oil of P. guineense and P. nigrum liana exhibits high amounts of sesquiterpenes ( %). The dominating constituent was (Z, E)-α-farnesene (28.7%) which was abundantly found only in the volatile oil from P. guineense (liana). It is also in lesser amounts in the other parts of the plant ( %). Additionally, the presence of myristicine (10.9%) was observed. The dominating constituents in the oils of lianas from P. nigrum were β- caryophyllene (36.0%) and δ-3-carene (14.4%). A comparison of the chemical profile of the oils from each species shows that only P. capense is fairly similar to the composition of oil from different tissues compared to those exhibited by others. In this study, β-pinene and β-caryophyllene were found in all species and were also identified as one of the major component in six and five samples respectively. The above results show that Piper species growing in Cameroon could serve as good sources of these industrial useful compounds. The diffe-

4 Tchoumbougnang et al. 427 Table 2. Comparative percentage composition of the essential oils from the fruits, leaves, and lianas or stems of P. capense (1), P. guineense (2), P. nigrum (3) and P. umbellatum (4) grown in Cameroon. Percent composition on DB-1 type column Fruits Leaves Lianas or stems Components RI MT MTH α-thujene t t α-pinene Camphene t t Sabinene β-pinene Myrcene α-phellandrene t t t δ-3-carene 1005 t t t α-terpinene t 0.1 t 0.8 p-cymene t t 0.5 Limonene β-phellandrene (Z)-β-Ocimene (E)-β-Ocimene t γ-terpinene Terpinolene OCM Sabinene hydrate t Linalol Camphor t t - Borneol 1154 t Terpinen-4-ol α-terpineol t t t Thymol Bornyl acetate ST STH δ-elemene α-cubebene 1352 t α-copaene β-cubebene t t t - - t t β-elemene α-gurjunene β-caryophyllene β-gurjunene t t t - α-bergamotene t t 1.2 (E)-β-Farnesene 1445 t t (Z)-β-Farnesene t α-humulene Valencene t Allo-Aromadendrene t Germacrene D α-selinene γ-muurolene t t -

5 428 Afr. J. Biotechnol. Table 2. Contd. α-curcumene β-zingiberene Bicyclogermacrene α-guaiene β-selinene (Z,E)-α-Farsenene β-bisabolene t t 4.2 t γ-cadinene 1509 t t Calamenene t δ-cadinene (E,E)-α-Farsenene Germacrene B OCS Elemol (E)-Nerolidol Spathulenol 1571 t - t t Caryophyllene oxide Humulene oxide Epi α-bisabolol Torreyol γ-eudesmol T-Cadinol α-cadinol 1645 t (E,E)-Farnesol AC Myristicine % of total identified t (<0.1%) = trace. RI = Retention indices on DB-1-type column., MT: Monoterpenes, MTH: Monoterpene hydrocarbons, OCM: Oxygen-containing monoterpenes, ST: Sesquiterpenes, STH: Sesquiterpenes hydrocarbons, OST: Oxygen-containing sesquiterpenes, AC: Aromatic compounds. rences of the essential oils content and composition between the leaves, lianas and fruits of these Piper may be attributed to the different plant tissues from which they were isolated. The results of the bioassays (Table 3) suggest that essential oils from the three Piper species analysed exhibited different inhibition levels against S. zeamais. The percentages of mortality increased with oil doses. Volatile oil from P. guineense exhibited a strong activity (LD 50 = 10.0 ± 0.3 µl/g) than those of P. capense (LD 50 = 16.1 ± 0.6 µl/g). The pairwise comparisons of different doses of essential oils of P. guineense with corrected significance level using the sequential Bonferroni procedure (Table 4) show that they were significantly different (P < < ' = 0.001) from (A/C to A/K) and from (B/D to B/K). But no significant difference was observed for other comparison. The oil from P. nigrum showed a lower activity (LD 50 = 26.4 ± 1.5 µl/g). Poudrox 5% used as a standard insecticide exhibited 100% mortality (significant differences with all other doses of oils from P. capense and P. nigrum; Table 4). As secondary metabolites contain in essential oils play an important role in plant resistance to insects (Prates et al., 1998), the results of this study suggest that the activity of these oils can be attributed to the monoterpenes ( %) found in the oils which appears to possess similar activities against all of the tested pest organisms. Similarly, essential oils from other Cameroonian plants and extract from P. guineense have been shown to possess high levels of insecticidal activity (Tapondjou et al., 2003; Ngamo et al., 2005; Asawalam et al., 2007). Our result lends some support to the empirical use of the grain powder from these plants as grain protectants by small scale farmers in rural area of Cameroon. ACKNOWLEDGMENTS One of the authors (Dr. F. Tchoumbougnang) thanks the TWAS (Third World Academy of Sciences) and the IPICS

6 Tchoumbougnang et al. 429 Table 3. Insecticidal activity of the essential oils from the fruits of P. capense, P. guineense and P. nigrum and positive control. Experimental Test group Positive control (Poudrox 5%) Dose (µl/g of grain) Insecticidal activity P. capense P. guineense P. nigrum Percentage of mortality A ± ± ±0.0 B ± ± ±0.5 C ± ± ±0.6 D ± ± ±1.5 E ± ± ±2.0 F ± ± ±3.5 G ± ± ±3.0 H ± ± ±3.0 I ± ± ±1.5 J ± ± ±0.0 K / 100.0± ± ±0.0 LD 50 (µl/g of grain) 16.1± ± ±1.5 Table 4. Statistical pairwise comparisons of different group (doses of oils) with corrected significance level using the sequential Bonferroni procedure. P. capense P. guineense P. nigrum Comparisons ' P-values ' P-values ' P-values A/B ns ns ns A/C ns <0.001* ns A/D <0.001* <0.001* ns A/E <0.001* <0.001* <0.001 * A/F <0.001* <0.001* <0.001 * A/G <0.001* <0.001* <0.001 * A/H <0.001* <0.001* <0.001 * A/I <0.001* <0.001* <0.001 * A/J <0.001* <0.001* <0.001 * A/K <0.001* <0.001* <0.001 * B/C ns ns ns B/D ns <0.001* ns B/E * <0.001* ns B/F <0.001* <0.001* <0.001 * B/G <0.001* <0.001* <0.001 * B/H <0.001* <0.001* <0.001 * B/I <0.001* <0.001* <0.001 * B/J <0.001* <0.001* <0.001 * B/K <0.001* <0.001* <0.001 * C/D ns ns ns C/E ns ns ns C/F ns ns ns C/G * ns * C/H <0.001* ns <0.001 * C/I <0.001* ns <0.001 * C/J <0.001* ns <0.001 * C/K <0.001* ns <0.001 * D/E ns ns ns

7 430 Afr. J. Biotechnol. Table 4. Contd. D/F ns ns ns D/G ns ns ns D/H <0.001* ns * D/I <0.001* ns <0.001 * D/J <0.001* ns <0.001 * D/K <0.001* ns <0.001 * E/F ns ns ns E/G ns ns ns E/H * ns ns E/I * ns ns E/J * ns <0.001 * E/K * ns <0.001 * F/G ns ns ns F/H ns ns ns F/I ns ns ns F/J ns ns <0.001 * F/K ns ns <0.001 * G/H ns ns ns G/I ns ns ns G/J ns ns <0.001 * G/K ns ns <0.001 * H/I ns ns ns H/J ns ns * H/K ns ns * I/J ns ns ns J/K ns ns ns * = Significant differences: P < '; ns = not significant. (International Program in the Chemical Sciences) for the grant which allowed him to finalize this paper. REFERENCES Adams RP (2001). Identification of Essential Oils by Gas Chromatography Quadrupole Mass Spectroscopy. Allured Publishing Corporation, Carol Stream, USA. Amvam Zollo PH, Biyiti L, Tchoumbougnang F, Menut C, Lamaty G, Bouchet PH (1998). Aromatic Plants of Tropical Central Africa XXXII, Chemical composition and antifungal activity of thirteen Essential oils from Aromatic Plant of Cameroon. Flavour Frag. J. 13: Asawalam EF, Emosairue SO, Ekeleme F, Wokocha R (2007). Efficacy of Piper guineense (Schum & Thonn) seed extract against maize weevil, Sitophilus zeamais (Motschulsky) as influenced by different extraction solvents. Int. J. Pest Manage. 53(1): 1-6. Delobel A, Tran M (1993). Les Coléoptères des denrées alimentaires entreposées dans les régions chaudes, ORSTOM, Paris. Hutchinson J, Dalziel JM (1963). Flora of West Tropical Africa., 2 nd ed, Vol 2, Crown Agents, London. Iwu M (1993). Hand book of African Medicinal Plants of West Tropical Africa. CRC Press, Boca raton. Jirovetz L, Buchbauer G, Ngassoum MB, Geissler M (2002). Aroma compound analysis of Piper nigrum and Piper guineense essential oils from Cameroon using solid-phase microextraction gas chromatography, solid-phase microextraction-gas chromatographymass spectrometry and olfactometry. J. Chromatogr. A 976: Joulain D, Köning WA (1998). The Atlas of Spectral Data of Sesquiterpene Hydrocarbons. EB-Verlag, Hamburg. Letouzey R (1972). Manuel de botanique forestière Afrique Tropicale. T2B, Centre Technique Forestier Tropical, Nogent-sur-Marne. Martins AP, Salgueiro L, Vila R, Tomi F, Caniguerai S, Casanova J, Proenca Da Cunha A, Adzet T (1998). Essential oils from four Piper species. Phytochemistry, 49: Menut C, Bessiere JM, Eyele Mve-Mba C, Lamaty G, Ouamba JM, Silou T, Amvam Zollo PH, Tchoumbougnang F (1998). Aromatic Plants of Tropical Central Africa XXXV, Comparative study of volatile constitents of Piper guineense Schum & Thonn from Cameroon and Congo. E. O. P. 1(1): Ngamo LST, Ngassoum MB, Mapongmestsem PM, Malaisse F, Lognay G, Haubruge E, Hance T (2005). Insecticidal properties of crude essential oils of the aromatic plants Lippia rugosa, Annona senegalensis and Hyptis spicigera from Cameroon on three major insect grain pests. Proceeding of the first international symposium on crops integrated pest management in the CEMAC zone, University of Dschang, pp Noumi E (1984). Les plantes à épices, à condiments et à arômes du Cameroun. Thèse Doct. 3 e cycle en Sciences Biologiques, Université de Yaoundé, Yaoundé, Cameroun, p Pino JA, Marbot R, Fuentes V, Payo A, Chao D, Herrera P (2005). Composition of leaf oil of Potomorphe umbellata (L.) Miq. and Agerantina havanensis (HBK) Kinget RM. J. Ess. Oil Res. 17: Prates HT, Santos JP, Waquil JM, Fabris JD, Oliveira AB, Forster JE, Embrapa E (1998). Insecticidal activity of monoterpenes against Rhizopertha dominica and Tribolium castaneum. J. Store Prod. Res. 34(4): Rice W R (1989). Analyzing tables of statistical tests. Evolution, 43:

8 Tchoumbougnang et al. 431 Sengupta S, Ray AB (1987). The chemistry of Piper species: a review. Fitoterapia 58: Sofowora A (1982). Medicinal plants and traditional medicine in Africa.John Wiley. Chichester. Tapondjou Azefack L, Adler C, Bouda H, Ajong Fontem D (2003). Bioefficacy of powders and essential oils from leaves of Chenopodium ambrosioides and Eucalyptus saligna to the cowpea bruchid, Callosobruchus maculatus Fab. (Coleoptera, Bruchidae). Cahiers d études et de recherche francophone/ Agriculture 12(6): Vogler B, Noletto JA, Haber WA, Setzer WN (2006). Chemical Constituents of the Essential Oils of three Piper species from Monteverde, Costa Rica, JEOBP 9(3):

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